only abort in test_help in production env

Signed-off-by: NJosé Valim <jose.valim@gmail.com>

railties/lib/rails/test_help.rb

-# Make double-sure the RAILS_ENV is set to test,
-# so fixtures are loaded to the right database
-abort("Abort testing: Your Rails environment is not running in test mode!") unless Rails.env.test?
+# Make double-sure the RAILS_ENV is not set to production,
+# so fixtures aren't loaded into that environment
+abort("Abort testing: Your Rails environment is not running in test mode!") if Rails.env.production?
 
 require 'test/unit'
 require 'active_support/core_ext/kernel/requires'